It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 142 420 421 is not a prime number.
For example, 142 420 421 can be divided by 11: 142 420 421 / 11 = 12 947 311.
For 142 420 421 to be a prime number, it would have been required that 142 420 421 has only two divisors, i.e., itself and 1.
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142 420 421 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 142 420 421 is about 11 934.003.
Thus, the square root of 142 420 421 is not an integer, and therefore 142 420 421 is not a square number.
The square of a number (here 142 420 421) is the result of the product of this number (142 420 421) by itself (i.e., 142 420 421 × 142 420 421); the square of 142 420 421 is sometimes called "raising 142 420 421 to the power 2", or "142 420 421 squared".
The square of 142 420 421 is 20 283 576 317 817 240 because 142 420 421 × 142 420 421 = 142 420 4212 = 20 283 576 317 817 240.
As a consequence, 142 420 421 is the square root of 20 283 576 317 817 240.
142 420 421 is a number with 9 digits.
The multiples of 142 420 421 are all integers evenly divisible by 142 420 421, that is all numbers such that the remainder of the division by 142 420 421 is zero. There are infinitely many multiples of 142 420 421. The smallest multiples of 142 420 421 are: